Apparatus for transferring images

Abstract

An apparatus for transferring a developed image on an image bearing member includes a transfer corona discharger disposed in opposition to the transfer position of the image bearing member, transfer material bearing member having a dielectric transfer material bearing surface and disposed to move the transfer material passing through the area between the image bearing member and the transfer corona discharger, and transfer material attraction charge applying device disposed on the downstream of the transfer position and in the space between the surface of the image bearing member and the transfer material bearing surface of the transfer material bearing member.

What we claim is: 
     
       1. Apparatus for transferring a developed image on an image bearing member onto a transfer material supported on transfer material bearing means, said transfer apparatus being characterized by the provision of transfer corona discharge means disposed opposed to the transfer position of the image bearing member; transfer material bearing means having a dielectric transfer material bearing surface and disposed to move the transfer material passing between said image bearing member and said transfer corona discharge means; and transfer material attraction charge applying means disposed on the downstream side of said transfer position and in the space between the surface of said image bearing member and the transfer material bearing surface of said transfer material bearing means. 
     
     
       2. A transfer apparatus as set forth in claim 1, which is characterized in that said transfer material bearing means is a drum having an opening covered with a dielectric sheet. 
     
     
       3. A transfer apparatus as set forth in claim 1, which is characterized in that said transfer material bearing means is a drum having an opening covered with a dielectric screen. 
     
     
       4. A transfer apparatus as set forth in claim 2 or 3, is characterized in that said transfer material bearing means is provided with a gripper for holding the leading end of the transfer material. 
     
     
       5. A transfer apparatus as set forth in claim 1, which is characterized in that said transfer material attraction charge applying means comprises a needle electrode. 
     
     
       6. A transfer apparatus as set forth in claim 1, which is characterized in that said transfer material attraction charge applying means comprises a saw tooth electrode. 
     
     
       7. A transfer apparatus as set forth in claim 1, which is characterized in that said transfer material attraction charge applying means comprises a thin wire electrode. 
     
     
       8. A transfer apparatus as set forth in claim 1, which is characterized in that the discharge electrode of said transfer material attraction charge applying means is directed to the transfer position. 
     
     
       9. Apparatus for transferring a developed image formed on an endless moving image bearing member onto a transfer material supported on transfer material bearing member, said transfer apparatus being characterized by: transfer corona discharge means disposed opposed to the transfer position of said image bearing member;   transfer material bearing means having a dielectric transfer material bearing surface and disposed for cyclically moving the transfer material passing through between said image bearing member and transfer corona discharge means; and   transfer material attraction charge applying means disposed on the downstream side of the transfer position and in the space between the surface of said image bearing member and the image bearing surface of said transfer material bearing means.   
     
     
       10. A transfer apparatus as set forth in claim 9, which is characterized in that said transfer material bearing means is a drum having an opening covered with a dielectric sheet. 
     
     
       11. A transfer apparatus as set forth in claim 9, which is characterized in that said transfer material bearing means is a drum having an opening covered with a dielectric screen. 
     
     
       12. A transfer apparatus as set forth in claim 10 or 11, which is characterized in that said transfer material bearing means is provided with a gripper for holding the leading end of the transfer material. 
     
     
       13. A transfer apparatus as set forth in claim 9, which is characterized in that said transfer material attraction charge applying means comprises a needle electrode. 
     
     
       14. A transfer apparatus as set forth in claim 9, which is characterized in that said transfer material attraction charge applying means comprises a saw tooth electrode. 
     
     
       15. A transfer apparatus as set forth in claim 9, which is characterized in that said transfer material attraction charge applying means comprises a thin wire electrode. 
     
     
       16. A transfer apparatus as set forth in claim 9, which is characterized in that the discharge electrode of said transfer material attraction charge applying means is directed to the transfer position.